/* wimax_ffb_decoder.c
 * WiMax Fast Feedback packet decoder
 *
 * Copyright (c) 2007 by Intel Corporation.
 *
 * Author: Lu Pan <lu.pan@intel.com>
 *
 * $Id: wimax_ffb_decoder.c 26103 2008-08-29 01:40:32Z wmeier $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1999 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/* Include files */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <glib.h>
#include <epan/packet.h>

extern gint proto_wimax;

/* forward reference */
static void dissect_wimax_ffb_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);

static gint proto_wimax_ffb_decoder = -1;
static gint ett_wimax_ffb_decoder = -1;

/* Setup protocol subtree array */
static gint *ett[] =
{
	&ett_wimax_ffb_decoder,
};

static gint hf_ffb_burst = -1;
static gint hf_ffb_num_of_ffbs = -1;
static gint hf_ffb_type = -1;
static gint hf_ffb_subchannel = -1;
static gint hf_ffb_symboloffset = -1;
static gint hf_ffb_value = -1;

/* FFB display */
static hf_register_info hf[] =
{
	{
		&hf_ffb_burst,
		{"Fast Feedback Burst", "wmx.ffb.burst", FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL}
	},
	{
		&hf_ffb_num_of_ffbs,
		{"Number Of Fast Feedback", "wmx.ffb.num_of_ffbs", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_ffb_type,
		{"Fast Feedback Type", "wmx.ffb.ffb_type", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}
	},
	{
		&hf_ffb_subchannel,
		{"Physical Subchannel", "wmx.ffb.subchannel", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_ffb_symboloffset,
		{"Symbol Offset", "wmx.ffb.symbol_offset", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}
	},
	{
		&hf_ffb_value,
		{"Fast Feedback Value", "wmx.ffb.ffb_value", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}
	}
};

/* Register Wimax FFB Protocol */
void proto_register_wimax_ffb(void)
{
	if (proto_wimax_ffb_decoder == -1)
	{
		proto_wimax_ffb_decoder = proto_wimax;

		/* register the field display messages */
		proto_register_field_array(proto_wimax_ffb_decoder, hf, array_length(hf));
		proto_register_subtree_array(ett, array_length(ett));
	}
	register_dissector("wimax_ffb_burst_handler", dissect_wimax_ffb_decoder, -1);
}

static void dissect_wimax_ffb_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	gint offset = 0;
	guint length, num_of_ffbs, i;
	proto_item *ffb_item = NULL;
	proto_tree *ffb_tree = NULL;

	/* update the info column */
	if (check_col(pinfo->cinfo, COL_INFO))
	{
		col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Fast Feedback Burst:");
	}
	if (tree)
	{	/* we are being asked for details */
		/* get the tvb reported length */
		length = tvb_reported_length(tvb);
		/* display Fast Feedback Burst dissector info */
		ffb_item = proto_tree_add_protocol_format(tree, proto_wimax_ffb_decoder, tvb, offset, length, "Fast Feedback Burst (%u bytes)", length);
		/* add Fast Feedback Burst subtree */
		ffb_tree = proto_item_add_subtree(ffb_item, ett_wimax_ffb_decoder);
		/* get the number of FFBs */
		num_of_ffbs =  tvb_get_guint8(tvb, offset);
		/* display the number of FFBs */
		proto_tree_add_item(ffb_tree, hf_ffb_num_of_ffbs, tvb, offset++, 1, FALSE);
		/* display the FFB type */
		proto_tree_add_item(ffb_tree, hf_ffb_type, tvb, offset++, 1, FALSE);
		/* display the FFBs */
		for(i = 0; i < num_of_ffbs; i++)
		{
			proto_tree_add_item(ffb_tree, hf_ffb_subchannel, tvb, offset++, 1, FALSE);
			proto_tree_add_item(ffb_tree, hf_ffb_symboloffset, tvb, offset++, 1, FALSE);
			proto_tree_add_item(ffb_tree, hf_ffb_value, tvb, offset++, 1, FALSE);
		}
	}
}
